More Information

If you are upgrading your Dynamics 365 organization from version 8.x to version 9.x, you cannot install version 9 of Dynamics 365 for Outlook prior to the upgrade of your Dynamics 365 organization. Dynamics 365 for Outlook is supported being one major version earlier than your Dynamics 365 instance (ex. 8.x client connected to 9.x instance) but the version of the client cannot be a higher major version than your Dynamics 365 instance (ex. 9.x client connecting to 8.x instance). To successfully connect a version 8.x client to a version 9.x instance, the following update is required because of the new TLS requirement: